UO Solar Radiation Monitoring Laboratory

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SRML Glossary — "U"

Special thanks to NREL

We'd like to thank the National Renewable Energy Laboratory for making available to us their glossary, which is the basis of ours. We've edited and reformatted it, and linked it to our Web pages, and we'll continue to add our own specialized terms, illustrations, and examples. Please note that the Solar Radiation Monitoring Laboratory takes full responsibility for any inaccuracies that may occur.

Links to other glossary sections:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


Ultraviolet Radiation
 
  The range of radiation just beyond the violet in the visible spectrum (at about 4,000 Angstroms or 400 nanometers(nm)) to the x-ray region (at about 40 Angstroms or 4 nm). Solar researchers tend to define the energetic region of the electromagnetic spectrum from 1 - 300 nm as the ultraviolet region. UV-A is in the 320-400 nm range, and UV-B is in the 280-320 nm range.
Uncertainty
 
  The expression of the amount of doubt that remains after a result is obtained. Although uncertainty may be subjective and without foundation ("We are 80% certain that nuclear fusion will be a power source in the 21st century"), many uncertainties are determined by statistical procedures ("Sampling polls indicate that 63% agree, with a possible 3% uncertainty") or measurement uncertainty (e.g., 3.204 ± 0.005 °C).
   
Links to other glossary sections:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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© 2000, UO Solar Radiation Monitoring Laboratory.
Last revised: December 11, 2000.


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